Testing-spectacles.



-O. HENKER.

TESTING SPECTACLES. APPLICATLON FILED JULY 10, 1914.

3,165,559? Pateilted De0.28,1915..

1; tea

@TTQ HENKER, OF JENA, GERMMY, ASSIGNOE TO THE FIE/M 01E CARL ZEISS, 0F JENA, GERMANY.

'rlnsrmer-srncracnns.

Specification of Letters Patent.

Patented Deco $8, il lfl.

Application filed July 10, 1914. Serial No. 850,110.

To all whom it may concern:

Be it lmown that I, O'r'ro Hermes, a citizen of the German Empire, residing at Jena, Germany, have invented a new and useful Improvement in Testing-Spectacles, of which the following is a specification.

In order to make it possible to determine in asimple manner for each eye the distance of the vertex of its cornea from the vertex of the spectacle-glass belonging to it, the new testing-spectacles are fitted both at the right and at the left side with an aiming device, which fixes a sighting plane, which is perpendicular to the. principal direction of vision of the patient and may be displaced parallel to this direction, the amount of such displacement being indicated on-a scale. Such a device may consists of, for instance, a diopter.

The; annexed drawing shows an example of how the invention may be carried out, Figure 1 being a side elevation and Fig. 2 showing the testing-spectacles trom above, partly in section, p

A bridge a supports ateither end a testglass carrier 2), each of which carriers can be set laterally by means of a milled-headed screw 0, which is journaled in brackets fixed to the bridge a and engages a nut b fixed to the carrier. Each of the test-/ glasses consists of a mount 0!, in which by means of a supporting ring 03 the test glass till ' each test-glass carrier 7) a stirrup ple side is fixed. -At the temple side of e is fixed, to which a temple-wire f is ad ustably fitted, by being attached, so as to pivot 1n a plane at right angles to the stirrup, t'o a fitting i, which can slide around the said stirrup. A screw f serves for clamping the fitting 1 to the stirrup e. To the temof each test-glass carrier there is further fixed, so as to reach into the stirrup e, a diopter consisting of two plates 9 containing parallel slots g:, the plane containing the two slots (the sighting plane of the diopter) being perpendicular to the axial direction of the test-glasses. Each diopter is. provided with a'scale h, to which there belongs an index 72. disposed on the respective test-glass carrier. For displacing each diopter parallel to the axial direction of the test-glasses a milled-headed screw 6, which proper d is journaled in the plate 9 and in a bracket g fixed to the same, engages a nut 12 fixed to the part b; Each scale and its index is so disposed that there is directly indicated on the scale the distance, which the sight- 1ng plane of the diopter in question has from the rear vertex of the test-glass d Wl'llCh lies in the same plane as the rear surface of the supporting ring (i A nosesupport is can be set in the vertical directlon by means of a milled-headed screw Z, whlch 1s ournaled in a part 70 fixed to the upper end of the nose-support is and engages a nut a fixed to the middle of the bridge a. I

When the testing-spectacles are in use, the nose-support, lthe test-glass carriers and the temple-wires must be set in such a manner that each glass takes up its proper position in front of its respective eye, when the testing-spectacles rest with the noses'upport on the nose and with the templewireson the ears of the patient. On each diopter being set for the respective eye in such a manner that its sighting plane touches the vertex of the cornea, the distance of this vertex irom the rear vertex of the respectivespectacle-glass can be read ofi directly on the corresponding scale.

I claim: a

1. Testin -spectacles comprising a bridge, two aiming devices connected to the said bridge end adapted each to determine a sighting plane lying perpendicular to the principal direction of vision of the wearer of the spectacles, the said aiming devices being each displacea-ble parallel to the said direction, two scale-bearing parts, each scale being adapted to indicate the amount of displacement of one such aiming device, temple-wires connected to the said bridge and means for adjusting the said wires each in .a vertical plane parallel to the said direction. I

2. Testing-spectaclescomprising a bridge.

two aiming devices connected to the.- said bridge and adapted each to determine a sighting plane lying perpendicular to the principal direction of vision of the wearer of the spectacles, the said aiming devices being each displaceable parallel to the said direction, two scale bearing parts, each scale 5 device, two temple-wires connected to the Witnesses:

bein adapted to indicate the amount of en the said stirrups and means for c1amp- 4 disp emergent:i of oxfie such aillm'ng device, two mg each temple-wn'e to its stirrup. stirrups xe to t e spectac es oneat either end, and passingeach arourid an aiming OTTO K said stirrup and adapted to be adjusted in PAUL Kafienng vertical'planes parallel to the said direction Fm'rz SANDER. 

